Energy level densities, Hilbert transform
In this paper, Richard C. Heyser explains how the conservation of total energy, the law stating that energy can be neither created nor destroyed in any process, is the underlying principle behind measuring sound through time delay spectrometry (TDS).
Heyser, Richard C. "Understanding Energy" (1980). Richard C. Heyser Collection, College Archives & Special Collections, Columbia College Chicago. http://digitalcommons.colum.edu/cadc_heyser_unpublished/30
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